<button type="button" class="btn btn-primary" (click)="isCollapsed = !isCollapsed"
        [attr.aria-expanded]="!isCollapsed" aria-controls="collapseBasic">Toggle collapse
</button>
<hr>
<div id="collapseBasic" [collapse]="isCollapsed" class="card card-block card-header">
  <div class="well well-lg">Some content</div>
</div>
